$main-color: #000;
$secondary-color: #fff;

body{
  background-color: lighten($main-color, 85%);
}

input{
  background-color: transparentize($secondary-color, 0.5);
  border: 0;
  display: block;
  font-size: 3em;
  margin: 15% auto;
  outline: none;
  padding: 0.4em;
  width: 20%;
}

@media only screen and (max-width: 600px){
  input{
    font-size: 2em;
    width: 40%;
  }
}
